docs: def tour(self, action='start', channel=0, start=True, tour_path_number=1):
          """
          Params:
              action              - start or stop
              channel             - channel number
              start               - True (StartTour) or False (StopTour)
              tour_path_number    - tour path number
          """
          ret = self.command(
              'ptz.cgi?action={0}&channel={1}&code={2}Tour&arg1={3}'
              '&arg2=0&arg3=0&arg4=0'.format(
                  action, channel, 'Start' if start else 'Stop',
                  tour_path_number)
          )
          return ret.content.decode('utf-8')